Texas Instruments TI-84 Plus Calculator "anything" Questions

..."a" at the top of the Mostly looking for a manual. Calculator will not add, subtract, multiply or anything. Anything pressed will only show the numbers that you put in but will not do anything with ...

undefined variable It says undefined variable when I try to graph anything. Why is this? what did I mess up, and does this have anything to do with clearing the variables? go to home and type Define x

My brightness is way high. I can barely see anything, and it's on it's darkest setting. It got proggresivly brighter, and now I can't see anything have you tried changing the battery?

...dollars example....11,12,13,14,15 round down to 10 16,17,18,19 round up to twenty. In the middle anything over 15 (like 15.25) rounds up to 20. Anything under 15 (like 14.75) rounds down to

invalid dim every time i enter anything into y=, it won't graph and comes up as an invalid dim. I'd rather not have to reset my entire calculator, is there anything else i can do?? please help!! Turn ...

Error light on, left bottom corner The error light is on and I cannot do anything My calculator has the (E ) and 0 symbol and I can not do anything Try using the tip of a pall point pen to press the ...

The screen still works but there are black lines across it so you can't see pretty much anything and I've tried resetting and turning off and on but nothing is working You can't do it anything. Thermo

Anything I type in I get A number with an exponent! Anything I type for an equation or problem it seems to keep giving me an exponent. Such As 66+66=1.32E2 that must be because you calculator is in ...

1,363 to the nearest hundred 1400. anything at or above the midpoint (50) is rounded up. and anything below is rounded down.

round 12,3478.561 to whole number Rounded to a whole number, it's 12,3479. anything .5 and over round up anything .499999999999 and under round down there are no buttons for this you have to do it as ...